Some manufacturers claim that non-hybrid sedan cars have a lower mean miles-per-gallon (mpg) than hybrid ones. Suppose that consumers test 254 hybrid sedans and get a mean of 26 mpg with a standard deviation of 4 mpg. Also, 237 non-hybrid sedans get a mean of 24 mpg with a standard deviation of 6 mpg. Suppose that both populations are known to be normal distributed. Conduct a hypothesis test to evaluate the manufacturers' claim. Test at a 4% level of significance. A.) What is the test statistic? Round your answer to three decimal places Test statistic= B.) What is the p -value? Round your answer to three decimal places. p -value = C.) Alpha: Decision: (Reject / Decline to Reject) the null hypothesis. Reason for decision: p -value ( < / > / <_ ) α Conclusion: There (is / is not ) sufficient evidence to conclude that the mean miles per gallon of non-hybrid sedans is less than that of hybrid sedans.
Some manufacturers claim that non-hybrid sedan cars have a lower
Conduct a hypothesis test to evaluate the manufacturers' claim. Test at a 4% level of significance.
A.) What is the test statistic?
Round your answer to three decimal places
Test statistic=
B.) What is the p -value?
Round your answer to three decimal places.
p -value =
C.) Alpha:
Decision: (Reject / Decline to Reject) the null hypothesis.
Reason for decision: p -value ( < / > / <_ ) α
Conclusion: There (is / is not ) sufficient evidence to conclude that the mean miles per gallon of non-hybrid sedans is less than that of hybrid sedans.
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